My project is required to be cross-platform, so I am using the C++ API for ArcObjects. My application creates a new thread which listens to a network socket broadcasting location information. I am attempting to read in the information and add points to my DynamicLayer. My problem comes when I try to use a new IPoint in the second thread. I can make the call:

IPointPtr newpoint(CLSID_Point);

But on the next line when I execute:


The application fails with a nonspecific error 'aborted'.

Relavant information: I am creating a new thread by calling pthread_create on a static method.

I have read the ESRI document on multithreading (which like the rest of the documentation is woefully absent of c++ specific information), but didn't see anything I thought could be the problem. Any thoughts?

  • 1
    Did you try using IGeometryBridge2? It's not geared towards IPoint objects, but I suppose you could have a multipoint with just one point in it. – Kirk Kuykendall Jun 28 '13 at 14:25
  • Thanks for the tip! This seems like exactly what I need! I'll give it a shot and post again when I have some results. – dykeag Jun 28 '13 at 14:44
  • That pointer to the IGeometryBridge was probably the right answer for .NET programmers, but it seems that those of us stuck in C++ cannot properly utilize it because many of the method calls require a SAFEARRAY, which is not well supported in ESRI's API – dykeag Jul 1 '13 at 13:13
  • Hmm, I thought the whole point of IGeometryBridge2 was to provide support for safe arrays. "The IGeometryBridge interface solves that problem allowing you to pass safe arrays instead." – Kirk Kuykendall Jul 1 '13 at 13:20
  • That is exactly the problem, I am having great difficulty constructing a SAFEARRAY within ESRI's environment. They provide us with an Array class (which I believe is supposed to encapsulate SAFEARRAY), but I was unable to add IPoint objects to it. – dykeag Jul 1 '13 at 13:22

Solution: In each thread you MUST call ::AoInitialize(NULL) in order to use ArcObjects!

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